/*
 * EmptyMatcher.java May 2007
 *
 * Copyright (C) 2007, Niall Gallagher <niallg@users.sf.net>
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or
 * implied. See the License for the specific language governing
 * permissions and limitations under the License.
 */

package wx.xml.simpleframework.xml.core;

import wx.xml.simpleframework.xml.transform.Matcher;
import wx.xml.simpleframework.xml.transform.Transform;

/**
 * The <code>EmptyMatcher</code> object is used as a delegate type
 * that is used when no user specific matcher is specified. This
 * ensures that no transform is resolved for a specified type, and
 * allows the normal resolution of the stock transforms.
 *
 * @author Niall Gallagher
 * @see wx.xml.simpleframework.xml.transform.Transformer
 */
class EmptyMatcher implements Matcher {

    /**
     * This method is used to return a null value for the transform.
     * Returning a null value allows the normal resolution of the
     * stock transforms to be used when no matcher is specified.
     *
     * @param type this is the type that is expecting a transform
     * @return this transform will always return a null value
     */
    public Transform match(Class type) throws Exception {
        return null;
    }
}
